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1 /*
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2 * Copyright 2001-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // There is a nice batch of tested generation sizing code in
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26 // TwoGenerationCollectorPolicy. Lets reuse it!
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27
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28 class GenerationSizer : public TwoGenerationCollectorPolicy {
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29 public:
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30 GenerationSizer() {
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31 // Partial init only!
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32 initialize_flags();
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33 initialize_size_info();
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34 }
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35
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36 void initialize_flags() {
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37 // Do basic sizing work
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38 this->TwoGenerationCollectorPolicy::initialize_flags();
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39
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40 // If the user hasn't explicitly set the number of worker
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41 // threads, set the count.
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42 if (ParallelGCThreads == 0) {
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43 assert(UseParallelGC, "Setting ParallelGCThreads without UseParallelGC");
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44 ParallelGCThreads = os::active_processor_count();
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45 }
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46
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47 // The survivor ratio's are calculated "raw", unlike the
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48 // default gc, which adds 2 to the ratio value. We need to
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49 // make sure the values are valid before using them.
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50 if (MinSurvivorRatio < 3) {
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51 MinSurvivorRatio = 3;
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52 }
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53
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54 if (InitialSurvivorRatio < 3) {
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55 InitialSurvivorRatio = 3;
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56 }
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57 }
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58
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59 size_t min_young_gen_size() { return _min_gen0_size; }
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60 size_t young_gen_size() { return _initial_gen0_size; }
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61 size_t max_young_gen_size() { return _max_gen0_size; }
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62
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63 size_t min_old_gen_size() { return _min_gen1_size; }
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64 size_t old_gen_size() { return _initial_gen1_size; }
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65 size_t max_old_gen_size() { return _max_gen1_size; }
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66
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67 size_t perm_gen_size() { return PermSize; }
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68 size_t max_perm_gen_size() { return MaxPermSize; }
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69 };
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